Genuine OEM Audi Multi-Ribbed Belt, part number 059903137AM. This belt is responsible for driving various engine accessories such as the alternator, power steering pump, and air conditioning compressor. It is located in the engine bay, wrapping around multiple pulleys. The belt is constructed from durable rubber composite for longevity. Genuine OEM belts are manufactured to exact specifications to ensure proper tension and alignment, preventing premature wear and accessory failure.